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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

280517 puzzles downloaded.

          5 1     14 2   11   12  
    3   13 11   16           15    
                      12     8 5
          8 10                 4
14 2     5           15   12      
              9   7           8
9           6   16     11 15   5  
        8     15 13 4 9          
          9 8 14 6     7        
  16   14 11     2   1           10
8           15   10              
      5   3           8     1 9
13                 3 16          
3 5     6                      
    2           1   11 9   7    
  9   7   1 3     10 6          
Showing puzzle number: 157
Puzzletype: Symmetrical Sudoku
Startnumbers: 72
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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